Hi Rob, the Cougar 2011 spec comes with the standard chassis (not the +8mm one).
But you're right, it's not that easy to fit the body especially because of the rear end...
There was a video somewhere on internet that show you the method to put on the body...
I personnally cut a little bit of the rear of the body (on the spur area) to help, and there are no problem at all.
Otherwise, you can buy the longer chassis
